Built-in safety features: 1) lid auto lock: the cooker cannot gain pressure when the lid is not well closed and the lid cannot be opened when the inner pressure is too high. 2) pressure auto-relief function: when temperature and pressure inside the cooker go beyond the normal value, the pressure discharging valve will discharge the steam to regulate. 3) de-pressure function: when pressure limit inside cooker fails and pressure goes beyond the limit, cooker automatically de-pressures around the lid to avoid an explosion. 4) temperature limit: power automatically cut offs when temperature inside cooker goes beyond preset temperature. 5) ultra-high temperature safe: power automatically cut offs when temperature inside cooker goes beyond limit value.